Why is it when you are joining quick draws together some people say it is not a good idea to put the aluminum karabiner of the one quick draw through the aluminum karabiner of the other quick draw, is it because the one quick draw might clip out of the other quick draw by accident or is there another reason why you should join the aluminum karabiner of the one quick draw through the nylon strap of the other quick draw?

a nother that u gotta remeber is that a lot of the biners we use have aluminium in them as a compund and aluminium is soft. If u are joining the 2 draws the biners wil get some where and tear on them (this is normal even if u are using a draw normally) but one of the biners will have rope going trhough it on the future (rember when using a draw to use one biner for the rope only and the other for the bolt only) and that damage in the biner will slowly damage the rop over time. it is not such a serious thing but u are shortening the life of ur equipment and u will never know by how mutch.

But then u always get into a kak sitiuation so make shure u aklways have a extra sling or 2 so that u an mod adraw on the go if needed

If you link clipgates and keep it tensioned, it is safe.
Metal on metal is not dangerous under normal condtitions,BUT if the gates apply a \"twisting\" force unto each other, it can break.
The gates are only designed to experience a force along its long axes.